This Tuesday, Aug. 19, 2014 photo shows boxes of Jell-O on a shelf at a store in Vauxhall, N.J. Despite its enduring place in pop culture, sales of Jell-O have tumbled 19 percent from five years ago, with alternatives such as Greek yogurt surging in poularity.

Jell-O can’t stop slippery sales slide

Yet despite its enduring place in pop culture, sales have tumbled 19 percent in the past four years, with alternatives such as Greek yogurt …